Novus N321S User manual

TEMPERATURE CONTROLLER
N321S
OPERATING MANUAL - V1.9x A
Man 5001244
The N321S is a controller intended for solar water heating applications. It controls
the water circulation system based on the difference of temperature between the
solar collector and the storage tank (or swimming pool).
The instrument contains two NTC-type temperature sensors and a control output
for activating the water circulation pump. It provides protections against overheating
and freezing to the piping, preventing damages to the system.
SPECIFICATIONS
INPUT SENSOR:
•NTC Thermistor, 10 kΩ
ΩΩ
Ω@ 25 °C; range: –50 a 120 °C (-58 to 248 ºF);
Accuracy: 0.6 °C (1.1 ºF);
Sensor interchangeability: 0.75 ºC (1.35 ºF). This error can be compensated
by the offset parameter in the controller.
Note: Two sensors with 3 m cables (2 x 0.5 mm2) are bundled together with the
controller. The sensor cables can be extended up to 200 meters.
Measurement Resolution: ................................................0.1º from –19.9 to 119.9º
..................................................................... 1 ºC elsewhere
OUTPUT1:............... Relay SPDT; 1 HP 250 Vac / 1/3 HP 125 Vac (16 A Resistive)
POWER SUPPLY: ............................100 to 240 Vac/dc ±10%
Optionally: ...........................12 to 30 Vdc/ac
Mains Frequency: ........................ 50~60 Hz
Power Consumption: ............................ 5 VA
DIMENSIONS: Width x Height x Depth: ............................75 x 33 x 75 mm
Weight: .......................................................................100 g
Panel: ................................................................70 x 29 mm
ENVIRONMENT: Operating:............................. 0 to 40 °C (32 to 122 ºF)
Storage temperature: ..........-20 a 60 °C (-4 to 140 ºF)
Relative humidity:............ 20 to 85 % non-condensing
CASE: .................. Polycarbonate UL94-2; Protection: Front panel: IP65, Box: IP42
....................................................................................Suitable wiring: Up to 4.0 mm2
RS-485 digital communication; RTU MODBUS protocol (Optional)
Serial interface not isolated from input circuitry.
Serial interface isolated from power supply input, except in 24 V models.
INSTALLATION
It is important to follow the recommendations below:
• Signal wires should be installed in grounded conduits and away from power or
contactor wires.
• The instrument should have its own power supply wires that should not be
shared with electrical motors, coils, contactors, etc.
• Installing RC filters (47 R and 100 nF, series combination) is strongly
recommended at contactor coils or any other inductor.
• Use protection devices like circuit breakers and fuses.
ELECTRICAL WIRING
Figure 1 below shows the controller connections to sensor, mains and outputs.
Figure 1 – N321S terminals
* The serial communication interface is optional.
OPERATION
The N321S contains several parameters that need to be configured in order to
determine system behavior.
These configuration parameters are organized in groups, the so called parameter
levels.
Level Function
0 Temperature Measurement
1 Setpoint Adjustment
2 Configuration
3 Calibration
Upon power-up, the N321S display shows for 1 second its firmware version. This
information is useful when consulting the factory.
Then, the temperatures of the sensors are displayed, according to the scheme
defined in the parameter “ind
indind
ind” . This is the parameter level 0(temperature
measurement level).
For accessing the level 1, press the key for 2 seconds until the “D0n
D0nD0n
D0n”
parameter appears. Release the key to remain on this level Pressing the
key sucessively the other parameters in this level are displayed.
For accessing the level 2, press the key for 4 seconds until the “unt
untunt
unt”
parameter appears. Release the key to remain on this level. Press again
to access the other parameters of this level. After reaching the last parameter, the
controller will return to the temperature measurement level.
Use the and keys to alter a parameter value. The display alternates the
parameters prompts and their respectives value.
Notes: 1 The configuration will be saved by the controller upon advancing
to the next parameter in a level.
2 If no keypad activity is detected within 20 seconds, the controller
saves the current parameter value and returns to the
measurement level.
Level 1 – Setpoint Adjustment
At this level, the display presents the setpoint parameters. They define the
differential temperatures values for the control. Use the and keys for
setting the suitable values.
D0n
D0nD0n
D0n Differential setpoint for activating the pump.
When the difference between T1 and T2 is higher than the value
configured in d0
d0d0
d0n
nn
nthe pump will be turned on.
Max d0
d0d0
d0f
ff
fvalue: 20 ºC.
D0f
D0fD0f
D0f
Differential setpoint for deactivating the pump.
When the difference between T1 and T2 is lower than the value
configured in d0f
d0fd0f
d0f the pump will be turned off.
Adjustable between 1 ºC and D0n
D0nD0n
D0n.
Level 2 – Programming Level
This level contains other configuration parameters that are needed for establishing
a proper system performance.
Unt
UntUnt
Unt
Unit
Temperature Unit – Defines the temperature unit to be
displayed.
0
00
0Temperature in degrees Celsius
1
11
1Temperature in degrees Fahrenheit
ind
indind
ind
Indication
Temperature value exhibited on the display.
0
00
0 Temperature of the collectors (T1)
1
11
1 Temperature of the storage tank (T2)
2
22
2Temperature difference between the sensors (T1 –T2)
3
33
3Alternates the indication of (T1), (T2) and (T1-T2) at every 3s.
I(e
I(eI(e
I(e
Ice
Setpoint for low temperature.
When the temperature in the solar collector is lower than the
value here configured, the pump is turned on, preventing the
water from freezing in the pipe system and causing damages to it.
Adjustable between spl
splspl
spl and sp
spsp
spk
kk
k.
kti
ktikti
kti
High
Temperature 1
Setpoint for high temperature (at collector).
When the temperature in the collector is above the value here
configured, the pump is turned off, avoiding the overheated water
from damaging the pipe system.
Adjustable between Spl
SplSpl
Spl and SPk
SPkSPk
SPk.
K
KK
Kt2
t2t2
t2
High
Temperature 2
Setpoint for high temperature at S2 (storage tank).
When the temperature at the sensor S2 is above the value here
configured, the pump is turned off in order to avoid thermal
discomfort.
This function is useful in swimming pool heating systems which
do not use dedicated third sensor.
Adjustable between spl
splspl
spl and spk
spkspk
spk.
kys
kyskys
kys
Histeresis
Antifreezing temperature hysteresis of sensor S1 (i(e
i(ei(e
i(e). In degrees.
Adjustable between 0.1 and 50.0 ºC
Ky1
Ky1Ky1
Ky1
Histeresis 1
Overheating temperature hysteresis of sensor S1 (kt1
kt1kt1
kt1). In
degrees.
Adjustable between 0.1 and 50.0 ºC

Ky2
Ky2Ky2
Ky2
Histeresis 2
Overheating temperature hysteresis of sensor S2 (kt2
kt2kt2
kt2). In
degrees.
Adjustable between 0.1 and 50.0 °C.
dly
dlydly
dly
Delay
Control start delay. After having the controller turned on, the
control output will be activated after the time programmed in this
parameter has lapsed.
Value in seconds, from 0 to 250 seconds.
0f1
0f10f1
0f1
Offset Sensor 1
Offset correction value for the temperature measured by the
sensor 1. This parameter allows for small adjustments in the
sensor 1 temperature reading. Measurement differences may
happen, for instance, when a temperature sensor is replaced.
Adjustable from -10.0 to 10.0 °C.
0f2
0f20f2
0f2
Offset Sensor 2
Offset correction value for the temperature measured by the
sensor 2. This parameter allows small adjustments to the sensor
2 temperature reading. Measurement differences may occur, for
instance, when a temperature sensor is replaced.
Adjustable from -10.0 to 10.0 °C.
sp
spsp
spl
ll
l
SP Low Limit
Lower limit of the setpoint value: defines the minimum value for
setpoint adjustment. In degrees.
Adjustable between -50 and 120 °C.
spk
spkspk
spk
SP High Limit
Upper limit of the setpoint: defines the maximum value for
setpoint adjustment. Must be defined with a value necessarily
higher than spl
splspl
spl. In degrees.
Adjustable between -50 and 120 °C.
Add
AddAdd
Add
Address
Modbus Address: used to define a unique network address in
instruments that are featured with the optional RS485 Modbus
RTU communication.
Address range is from 1 to 247.
Nível 3 – Calibration level
The N321S inputs are factory calibrated and recalibration should only be done by
qualified personnel. If you are not familiar with these procedures do not attempt to
calibrate this.
Press the key for 10 seconds to access this level. This level contains also the
parameters for configurating the protection.
If you have entered this level accidentally, go through all the parameters without
making any changes until the controller returns to the measurement level.
pas
paspas
pas
Password - Enter the correct password to unlock write operations in
the following parameters.
[
[[
[l
ll
l1
11
1
Calibration Low Input 1 – Input 1 offset.
[
[[
[k
kk
k1
11
1
Calibration High Input 1 – Gain adjustment (full scale value).
[l2
[l2[l2
[l2
Calibration Low Input 2 - Input 2 offset.
[k2
[k2[k2
[k2
Calibration High Input 2 – Input 2 gain adjustment (full scale value).
FA(
FA(FA(
FA(
Factory Calibration - Restores factory calibration parameters.
Change from 0to 1to restore the calibration parameters with factory
values.
Prt
PrtPrt
Prt
Protection - Defines the levels of parameters that will be password
protected. See "Configuration Protection" for details.
Pa(
Pa(Pa(
Pa(
Password Change - Allows changing the current password to a
new one. Values from 1 to 999 are allowed.
Sn2
Sn2Sn2
Sn2
Serial number 2 - First part of the controller electronic serial number.
sn1
sn1sn1
sn1
Serial number 1 - Second part of the controller electronic serial
number.
sn0
sn0sn0
sn0
Serial number 0 - Third part of the controller electronic serial
number.
WORKING WITH THE CONTROLLER
While the solar collector is receiving energy, the temperature in the sensor S1
increases. When T1 – T2 is higher than the value specified in d0n
d0nd0n
d0n, the pump will
be turned on, circulating the heated water down and storing it in the tank.
As the pump is operating, the hot water will circulate downwards and the cold water
goes upwards. Consequently, the temperature difference between S1 and S2 tends
to diminish. When this difference goes under the value configured in d0f
d0fd0f
d0f, the
pump will be turned off and the water circulation will stop.
The signaler P1 at the front panel of the controller will light up when the control
output is activated.
Figure 2 – Front Panel
Indicator Function
T1 Sensor 1 temperature
T2 Sensor 2 temperature
T1 T2 S1 – S2 (Differential Temperature)
CONFIGURATION PROTECTION
A protection system to avoid unwanted changes to the controller parameters is
implemented. The level of protection can be selected from partial to full. The
following parameters are part of the protection system:
Pa
PaPa
Pas
ss
s: When this parameter is presented, the correct password should be
entered to allow changes of parameters in the following levels.
Prt
PrtPrt
Prt: Defines the level of parameters that will be password protected:
1- Only calibration level is protected (factory configuration);
2- Calibration and configuration levels are protected;
3– All levels are protected – calibration, configuration and setpoints;
PA(
PA(PA(
PA( Parameter for definition of a new password. Since it is located in the
calibration level, can only be changed by a user that knows the current
password. Valid passwords are in the change 1 to 999.
CONFIGURATION PROTECTION USAGE
PAS
PASPAS
PAS parameter is displayed before entering a protected level. If the correct
password is entered, parameters in all following levels can be changed. If wrong or
no password is entered, parameters in the following levels will be read only.
Important notes:
1 - After five consecutive attempts to enter a wrong password, new tentative will be
blocked for the next 10 minutes. If the current valid password is unknown, the
master password can be used only to define a new password for the controller.
2 - The password for a brand new device is 111.
MASTER PASSWORD
The master password allows user to define a new password for the controller, even
if the current password is unknown. The master password is based in the serial
number of the controller, and calculated as following:
[ 1 ] + [ higher digit of SN2 ] + [ higher digit of SN1 ] + [ higher digit of SN0 ]
For example the master password for the device with serial number 987123465 is: 1936
As follows: sn2
sn2sn2
sn2= 987; sn1
sn1sn1
sn1= 123; sn0
sn0sn0
sn0= 465 = 1 + 9 + 3 + 6
How to use the master password:
1- Enter the master password value at PaS
PaSPaS
PaS prompt.
2- Go to PA(
PA(PA(
PA( parameter and enter the new password, which must not be zero (0).
3- Now you can use this new password to access all controller parameters with
modify rights.
ERROR MESSAGES
Sensor measurement errors force the controller outputs to be turned off. The cause
for these errors may have origin in a bad connection, sensor defect (cable or element)
or system temperature outside the sensor working range. The display signs related to
measurement errors are shown below:
•Measured temperature exceeded maximum allowed
range for the sensor. Short circuited NTC sensor.
I
II
IND
NDND
ND = 0
00
0or 1
11
1
•Measured temperature is below minimum measurement
range of the sensor. Broken NTC.
IND
INDIND
IND = 0
00
0or 1
11
1
•If the temperature in S1 or S2 exceeds the measurement
limit IND
INDIND
IND = 2
22
2, the differential value displayed is 0
00
0.
DESIGNATION SYSTEM
N321S -485 - 24V
A B C